Unusual weather? The Boston Marathon must go on

Jonathan Phelps @JPhelps_MW

Monday

Apr 16, 2018 at 8:15 AMApr 16, 2018 at 8:15 AM

HOPKINTON — The weather for the Boston Marathon is always unpredictable, but it must go on.

While there have been close calls, the race has never been canceled in its 122 year history because of weather conditions. The weather at today's start is expected to be nearly 30 degrees cooler than last year's race.

The rain isn't stopping most of the runners spirits here at Athletes Village!@bostonmarathon#Boston2018pic.twitter.com/KuyFRZYJnt

— Jon Phelps (@JPhelps_MW)April 16, 2018

Last year the weather on the course was about 75 degrees, according to meteorologist Cindy Fitzgibbon, from the Daily News' media partner WCVB.

This year, sleet mixed with snow started to accumulate just after 10 p.m. Sunday. The high today will be about 50 degrees and the rain will become the heaviest about 2 p.m., according to Fitzgibbons.

Good morning! Rain and wind will have a big impact on the marathon today. Icing concerns N&amp;W this morning and then watching a band of heavy rain and possible thunder shifting in 2-6pm. A head wind (E 20-30mph+) and temps in the 40°s the entire route. Turn on#wcvb for more!pic.twitter.com/nh9miKRBsz

&mdash; Cindy Fitzgibbon (@Met_CindyFitz)April 16, 2018

The Boston Athletic Association, which organizes the Marathon, has records on the weather dating back to 1905.

Here are some of the unusual weather conditions over the years compiled by the BAA: